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JTAG ICE User Guide
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Congratulations on purchasing Atmel’s AVR® JTAG ICE. The JTAG ICE is a complete
tool for On-chip Debugging on all AVR 8-bit microcontrollers with the JTAG interface.
The JTAG interface is a 4-wire Test Access Port （TAP） controller that is compliant with
the IEEE 1149.1 standard. The IEEE standard was developed to enable a standard way
to efficiently test circuit board connectivity （Boundary Scan）。 Atmel AVR devices have
extended this functionality to include full Programming and On-chip Debugging support.
The JTAG ICE uses the standard JTAG interface to enable the user to do real-time
emulation of the microcontroller while it is running in the target system.
The AVR On-chip Debug protocol （AVROCD） gives the user complete control of the
internal resources of the AVR microcontroller. The JTAG ICE provides emulation capability at a fraction of the cost of traditional emulators.
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